Work-holder



May W, W36.. D. H. cHAsoN lWORK HOLDER Filed Jan. lO,

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Patented May 19, 1936 UNITED STATES PATENT OFFICE WORK-HOLDER Daniel H.Chason, Elizabeth, N. J., assignor to The Singer Manufacturing Company,Elizabeth, N. J., a corporation of New Jersey Application January 10,1935, Serial No. 1,150

1 Claim.

whichholds one end or side of cloth or other flexible material when itis desirable to subject the material to tension for the purpose ofripping a seam or performing other operations thereon.

The several features of the present invention will be clearly understoodfrom the following description and accompanying drawing in which:

Figure l is a perspective View of a work-holder embodying the inventionin its preferred form.

Figure 2 is a rear side elevation.

Figure 3 is a detail sectional View taken along the line 3-3 of Figure2.

Figure i is a rear side elevation, partly in section, to show therelation of the parts.

In the embodiment shown, my improved workholder comprises a clamp l ofsubstantial U- shaped formation, the upper limb of which is adapted toengage a table-top 2. The lower limb has a threaded opening therethroughin which is threaded a clamping-screw 3 having a swivel head f2 forengagement with the under face of the table. The clamp is lined withfelt or other soft fibrous material as shown vat I in Figure 2.

Formed integral with the clamp I is a lower Jaw 5 having a lateralextending clamping portion 6. Pivotally secured by the pivot-pin 'I tothe lower jaw 5 is an upper jaw 8 having on its free end a laterallyextending clamping portion 9 which cooperates with the clamping portionE. The other end of the upper jaw 8 is bifurcated to form the arms Illand Ill which embrace an eccentric II pivotally secured to the xed lowerjaw 5 by the pivot-pin I2. Formed integral with the cam I I is anger-lever I3.

From the foregoing it will be evident that when S the linger-lever I3 israised the eccentric II acts on thev arm IQ to positively swing theupper jaw 8 in a counter-clockwise direction about its pivot to open thejaws and when the lever I3 is depressed the cam il acts on the arm Iilto posiii) tively close the jaws.

Having thus set forth the nature of the invention, what I claim hereinisz- A Work-holder comprising a sheet-metal body portion bent flatwiseof itself into a U-shaped clamp to embrace the edge of a table-top, aclamp screw threaded into the lower limb of the U- clamp, the upper legof the U having a flat upstanding stationary member extended at one sidein the plane of said member to form an upwardly curved limb the free endof which is bent over laterally to form a clamping jaw, a movablesheet-metal member having a body portion pivoted toK said stationarymember and exten-ded at one side to form a downwardly curved limbthefree end of which is bent laterally to form a clamping jaw opposed tothe lirst mentioned clamping jaw, the body portion of said movablemember being formed with a slot, and a hand operated eccentric memberpivoted to the first mentioned member and engaging the walls of saidslot.

DANIEL H. CHASON.

